The best indication that dreaming serves a necessary biological function is provided by the fact that
A) most dreams are psychologically meaningless.
B) the disruption of REM sleep leads to narcolepsy.
C) most mammals experience REM rebound.
D) sexual tension is naturally discharged during REM sleep.

Question

Quizplus · Accepted Answer

The fact that most mammals experience REM rebound (an increase in the amount and intensity of REM sleep following a deprivation of it) suggests that REM sleep (and thus, dreaming) serves some necessary biological function. This is because evolutionary theory suggests that if a behavior or trait is widely found across species, it likely evolved because it was necessary for survival or reproduction. A and D are not supported by research, and B is a reverse causality inference.

The Best Indication That Dreaming Serves a Necessary Biological Function